Moscow's air is polluted at the best of times, but this smog, heavy with carbon monoxide, makes breathing difficult.
莫斯科的空气，在最好的时候是受到了污染，而这种烟雾里含有大量的一氧化碳，让人呼吸困难。
This makes breathing difficult and painful, and can also limit the amount of oxygen a person takes into their body with each breath.
这使呼吸变得困难且痛苦，并且会限制每次呼吸时进入人体的氧气量。
COPD is a serious lung disease that makes breathing difficult. Symptoms can include breathlessness, chronic cough and excessive phlegm.
COPD是一种严重的肺病可造成呼吸困难，症状包括呼吸困难、久咳和痰多。
Your blood vessels may expand. This causes the skin to become red. air passages in the throat and lung may shrink. This makes breathing difficult.
你的血管可能扩张。这使得皮肤变红。喉和肺部的气管可能收缩，使呼吸变得困难。
That makes breathing very difficult.
使得呼吸非常困难。
That makes breathing very difficult.
使得呼吸非常困难。
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